Krios (Greek: Κριός) is a stream (little river) in the municipal unit of Aigeira, in Achaea, southern Greece. Its source is on mount Chelmos, near the village Perithori. It flows near the ancient city of Felloi and the villages Sinevro, Oasi, Kasaneva and the Mycenaean acropolis of ancient Aigeira. The stream empties into the Gulf of Corinth near Aigeira.